Easy arbitrary meta-tags

[gsteel]

A simple way of discovering arbitrary meta tags and passing them on to headMeta() view helper - i.e. the mask with a fragment like this:

"meta_group":{
  "type": "Group",
  "fields":{
    "meta_name":{
       "type":"Text",
       "config":{"label":"Meta Name"}
    },
    "content":{"type":"Text","config":{"label":"Value"}
  }
}